<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/dijit/themes/tundra/tundra.css"/>
    <link rel="stylesheet" type="text/css" href="http://localhost/arcgis_js_api/library/3.17/3.17/esri/css/esri.css" />
    <script type="text/javascript" src="http://localhost/arcgis_js_api/library/3.17/3.17/init.js"></script>
    <script>
        require(["esri/map","dojo/domReady!"],
            function(Map){
                var myMap = new Map("mapDiv",{
//                    basemap:"topo"
                    basemap:"osm"
                });

            })

    </script>
</head>
<body class="tundra">
    <div id="mapDiv" style="width:900px; height:600px; border:1px solid #000;"></div>
</body>
</html>